James a



(Nomodel.) 1

' J'. A. ROBB.

` FEED MEGBANIgM POR LATE SAWING MACHINES. No. 2`r8`,4 l Patented N,ov.'13, 1883.

f'fql. hl

UNITED STATES PATENT OFFICE..

JAMES A. ROBE, OF sAi\T Josit, CALIFORNIA.

FEED MECHANISM FOR LATH-SAWING MACHINES.

SPECIFICATION formingpart of Letters Patent No. 288,493, dated November 13, 1883.

f Application filed June 4, 1883. (No model.)

fo all whom it may concern:

-Be it known that I, JAMES A. ROBB, of San Jos, in the county of Santa Clara and State of California, have invent-ed certain new and useful Improvements in Feed Devices of Lath- Sau-'ing4 Machines and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings.

My invention relates to improvements in the feed mechanism of machines for Vsawing out stuff for latbs and like purposes, in which a set of feed-rollsadvance the slab or stuff to and carry it past a gang of saws, and a set or sets of. pressure-rolls arranged over the feedrolls operate to produce regular feed Or progression of the material through the machine.

My improvements consist, first, in making each pressure-roller of the set self-adjusting in a vertical direction, and also, in connection therewith, providing a lifting device or means by which the entire set is raised and handled together. This part of my improvement provides for an independent adjustment of each pressure-roll, by which the several rolls can automatically adapt themselves to any irregularity or difference in thickness of the slab or stuff. It also ena-bles the whole set to be raised and handled by a single bar or operating-lever when placing stuff in the machine, and at other times, as required in the work being done. y v

TheV second part of my improvement consists in anovelmeans of hanging and supporting the shafts that carry the pressure-rolls, whereby the weight of the rolls on. one end of the shaftis counteracted and the shaft sustained and caused to move always in horizontal position or uniformly at both ends while being raised and lowered. By means of this part of my invention the shaft-boxes are relieved of irregular strain and friction, and pressure-rolls of heavy weight are easily and readily handled.

Referring to the accompanying drawings, Figure 1 is an elevation of a machine to which my improvement is applied. Fig. 2 is aplan or top view of Fig. l. Fig. Sis avertical section taken longitudinally through the-center of the machine. Fig. 4 is a vertical cross-section taken through the center of vthe supporting frame and hangers that carry the independently-adjustable pressure-rolls.

A A represent the bed and frame-work, of any suitable construction to support a sawarbor and furnish bearings for the necessary shafts and other mechanism.

B is the saw-arbor, and C its driving-pulle 5l) D are the shafts carrying the feed-rolls D D2, and E E are the pulleys that drive them. Theseshafrs have bearings in boxes dd at the opposite side. y

. G is a pressure-roller mounted on the free outer end of a shaft, g, that is held in sliding boxes h h" in the standards or guides h2 71.2. These Vboxes are immediately over and in line with the feed-roller-shaftboxesdel of shaft D. Similar guides, h3 h3, on the opposite end of themachine-frame, beyond the saw-arbor, support a box', H, within which are suspended, each i11- dependent of the other, a number of toothed or barbed pressure-rolls, I I. These rolls or toothed disks are equal in number to the saws, and they are set to bear upon theslab or thickness' of stuff between the saws. The frame or box H is supported by a shaft, K, which rests 4in a sliding box, k', in the slot ofthe standard t", and extends across the machine-frame to a similar box on the other side. This shaft and roller D?. Vertical movement of the box H is obtained through the medium of a treadle and connecting-rods and levers attached to the shaft K, by which the whole set of rolls or pendent movement and separate adjustment they accommodate themselves to the irregularities and unevenness of the surface of the work. For this purpose the box His a frame with ways, grooves, or guides m m, and arod or fixed shaft, n, is carried across at the top the lifting-shaft K. Slotted plates or slides P, suspended from the shaft n, are set side by side in the guides, but sufficiently clear of one another to slide freely up anddown. From these slides P hangers pp furnish `bearings for the disks I. Each plate l? therefore supports a the fixed shaft n across the top of the vertically-movable frame or box H. The slots Z Z in these plates are long enough togive considon the frame at one side, and in similar boxes disks I can be raised and held up. An inde-- of each roll are provided, however, by whichits bearings are immediately over the shaft of v parallel with but somewhat above the line of IOO disk, and the whole set are suspended from 2 esmas erable vertical movement, and according to the capacity of the machine or the diameter of the saws employed. Independent movement of the disks is thus provided, while the wh ole set can be raised andheld up at any time to clear the log, or to adjust them to the work when newly entered. This lifting mechanism consists of a rock-shaft, It, over which is placed a sleeve, It', having an arm, S, secured to it at one end and a similar arm, S', at the opposite end, near the saw. These two arms have forked ends tt, that embrace the shaft K. A rocking arm, T, is also secured to the sleeve, and its free en d is connected with the inner end of a lever of the second order, V, by a pitman, u. The fulc'rumof this lever is at V, and its outer end terminates in a pedal beyond the frame.

- Pressure upon the lever will depress the arm T and raise the box II in its guides.

`venience of the operator.

control of the workman, it gives .him perfect command over the pressure-rolls.

The peculiar application and arrangement of the rock-shafts R R and the arms S S S S preserve the horizontal position of the rollershafts and cause them to move up and down smoothly without binding at either end in the guides. The tendency of the greater weight at the outer ends is to throw the boxes out of line and cause the shafts to lift unevenly; but this is counteraeted by the arms S, and equal support is given to both ends of the shaft just inside the guides. By connecting the arms S S of each rock-shaft together, a stiff frame is produced and uniform movement insured.

This is the purpose of the brace or tie-rod y. (Seen in Fig. 2 of the drawings.)

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a lathsawing mill or machine of like character, the combination of a feed-roll, a gang of suspended pressure-rolls, each one of 5o which has an independent selfadjusting vertical movement in vertical ways, with said vertical ways, and with mechanism, substantially as described, for lifting or dropping the whole set or gang at once, as set forth.

2. In a sawing-machine, the combination, with the slotted guides h3, ofthe box H, moving therein, slotted plates P, working in the boxes II, provided with the hangers p p, in which the rolls are suspended, rod n, passing through the 6o slots in the plates P, shaft K,to which the whole series of rolls I I are connected, and Aa rockshaft, R, and connections, substantially as set forth, for moving the entire set of rolls, substantially as set forth.

3. The combination, with the pressure-roll shaft g, ofthe sliding boxes in which it is held, guides h, on which the boxes move, rock-shaft R, tie-rod y, arms S2 S3, which are secured to shaft It and loosely take hold of shaft lf/,arm fw, 7o secured to shaft R, lever IV, and connection w, whereby the shaft g is raised orlowered.

4. In a saw-mill or machine of the kind described, the combination of the pressure-roll shaft, and rolls suspended thereby,`with a rock- 7 5 shaft, as R, and connections, as S S, between the two shafts, a lever or treadle, and connections to the rock-shaft, whereby the pressureroll shaft is depressed or elevated.

fitness my hand and seal.

J AMES A. ROBE. [1.. s]

Vitnesses:

EDWARD E. OsBoRN, RoB'r. YOUNG. 

